Unmanned aircraft



FIG. 1 is a front perspective view of an unmanned aircraft showing our new design;

FIG. 2 is a front view of an unmanned aircraft;

FIG. 3 is a back view of an unmanned aircraft;

FIG. 4 is a right side view of an unmanned aircraft.

FIG. 5 is a left side view of an unmanned aircraft;

FIG. 6 is a top view of an unmanned aircraft; and,

FIG. 7 is a bottom view of an unmanned aircraft.

The broken lines in the drawings showing elements of the unmanned aircraft form no part of the claimed design. 

CLAIM The ornamental design for an unmanned aircraft, as shown and described. 